"Since handwriting is so laborious, it leaves LESS time for thinking about what to write down, not more."

A bit in undergrad but quite a lot in grad school, I ended up stopping taking notes. I discovered I was better off engaging completely in class, and consulting the textbooks if necessary, than trying to multitask learning and taking notes. YMMV; I can easily believe there are people who had the exact opposite experience, that note taking radically improved their retention. I'm just saying that such experience is definitely not universal.